Device for recording the speed of shutters in photographic apparatus



June 28, 1960 A. w. zn-:GLER 2,942,929

DEVICE FOR RECORDING THE SPEED OF' SHUTTERS IN PHOTOGRAPHIC APPARATUS 3 Sheets-Sheet 1 Filed Jan. 28, 1958 LAMP q I'F MOTOR I gaf/If.

June 28, 1960 A. W. ZIEGLER DEVICE FOR RECORDING THE SPEED OF' SHUTTERS IN PHOTOGRAPHIC APPARATUS Filed Jan. 28, 1958 I5 Sheets-Sheet 2 M) F/G. 6

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DEVICE FOR RECORDING THE SPEED OF' SHUTTERS IN PHOTOGRAPHIC APPARATUS Filed Jan. 28, 1958 3 Sheets-Sheet 3 23 20 /06 7 aa 4o @VGZ/MM@ ATOM/Ev United States Patent Arthur W. Ziegler, '47 Meadowbrook Road, Short Hills, NJ.

Filed '.lan. 28, 1958, Ser. No. 711,625 10 Claims. (Cl. 346-108) This invention has reference to a device for recording the speed of shutters in camera and like photographic apparatus.

Applicant is aware that attempts have been made to determine the speed of shutters in photographic apparatus by the use of complex and costly equipments, which have been found to require exacting manual control while in operation, and insufficiently accurate even when such equipments are attended by experienced and skilled personnel.

The object of the present invention is the provision of a device `of the type above referred to, which is simple in construction, cheap to manufacture, and wherein the speed of a shutter in a photographic apparatus is recorded on a light sensitized tilm in an accurate manner without the aid of experienced or skilled operators.

The novel `features of the invention will appear from the following description and by the claims appended thereto, reference being had to the accompanying drawing in which:

Fig. 1 is a plan view of the shutter speed'recording device of the invention, showing a photographic apparatus mounted in rfocal adjusted position on theframe of the device, recording lmechanism shown with portions broken away;

Fig. 2 is al side elevation view ofthe recording device with the frame shown with portions broken away tof show the gearing mechanism more clearly;

Fig. 3 is a vertical sectional view taken -on` line 3 3 of Fig. l, showing a number of operating parts of the recording mechanism with portions broken away, one of the keys and a gearvshiftable by the movement of that key being shown in the operated position;

Fig. 4 is an horizontal sectional view taken on line 4-4 of Fig. 3 showing the gear driving mechanisms for selectively actuating a light reflecting mirror at diterent speed;

lFig. 5 is a developed view of a portion of the drum forming part of a light pulse generating mechanism, showing Ithe disposition of light paths in the drum; and

Fig. 6 is a view of a photographic film showing the picture of light pulses during the operation of a shutter in a photographic apparatus recorded thereon by the device of the invention. Y

'I'he Shutter speed recording device of the present invention consists of a mounting frame formed of two plates 10 and 11, held in spaced relation to each other by Va number of similar spacer members 12 having one oftheir ends screw threaded in the plate 10, and their other ends secured to the plate 11, as by screws 13, while two spacer members 14 serve to hold the free end of anextended portion 15 formed with the plate 10 in spaced relation from plate 11 to which the spacers 14 are secured, as by similar screws 16.

A shaft 17, Figs. 2, 3 and 4, is journaledY in plates 10 and a number of operating par-ts of the and 11, having its lower disposed end extending a f small distance from plate 11, foroperatively connecting the sha-ft of a reversible constant speed operating motor (not shown), having in actual practice a speed of 1800 r.p.m., while the other end of this shaft, which extends above the mounting plate 10, is formed with a collar serving, in cooperation with a knob 19, for securing a bell-shaped drum 20 on .this end of the shaft, the rim 21 of this drum, as best seen in Figs. 3 and 5, being provided, in the present device, with rows of holes of .050 diameter for example, disposed apart a distance of two degrees, forming light paths from a light source in the Iform of a lamp 23, Figs. 1, 2 and 3, vertically mounted on the plate 10 inwardly of the drum.

An arcuate upright disposed strip or plate 24 is formed lwith a base at right angles thereto for securing such proximity of the drum, the strip 24 is provided 27, having a width of .0

as by screws 25 and 26, while lwith a vertically disposed slit 50 inch, forming an elongated light path of a length corresponding to the distance between the light paths formed by hole 22x at the top of the drum and the hole 22x2 adjacent the lower edge of the rim formed drum, as shown in Fig. 5.

'In the mounting plate 10 is formed an arcuate slot 28F through which the handle of a manually operable lever member 28, Figs. 1 and 3, extends. This lever member is mounted for a small angular movement on a hub 29 formed to the under side of plate 10, and this lever member is held in position thereunder by two similar screws 30 fitted in arcuate slots 31 concentric to shaft 17. Lever 28 is formed with an upward extending arm 29y projecting .through a slot ST in the plate 10 in juxtaposition to the outer periphery of the drum 20 to serve as a shutter over the rows of light paths formed in the drum 20 by holes 22, and over lthe elongated light path `formed -by the slit 27 inl strip 24. Lever member 28 in addition is formed, as best seen in-Fig. l, with an'arm 32 `forked at its Ifree end for 33 extending downwardly through a slot 34 in the plate 10, with one of its ends secured to an oblong shaped bar' 35 mounted for longitudinal sliding movement between guiding members 36 and 37 carried by the frame plate 10. On bar 35 is mounted a pawl 38, held normally in position shownlin Fig. 1, by secured to the bar 35 as 4by a rivet 38x, carried by pawl 38 extends downwardly into a slot in bar 35 for limiting the movement of this pawl in one direction against the normal `tension of a retractile spring 38y,

while permitting the movement of this pawl when actuated inY a manner as will befhereinafter described in den rotation of this shaft, while the disc carrying a mirror 40, silver coated on both sides, is held from rotation on shaft 46 Aby the lug 104 of lever 99 engaging the notch 102 of the disc.

A spring washer 88 which may be tensioned by a knob 87 which is screw threaded on `the end of shaft 46, serves in cooperation with a shoulder 86 formed with the shaft 46, 'for frictionally `driving the disc' and mirrorunit 40-105 upon the rotation of the as above mentioned, lis normally rthe operation `of shaft 46 by shaft 46, but this unit, held from rotation upon the lug 104 of angle lever '99 engaging the notch 102 by the vtension of a springr Patented June 28, 1960 engaging a pin a Spring 38y while a pin 38z v 107 of the contact set C3, the spring 107 bearing against a pin 108 carried by .the arm F1 of pawl 99.

On shaft 17 is mounted a pinion 41, Figs. 3 and 4, secured thereto as by a pin P. This pinion meshes with a gear 42l which may be formed with or secured to a pinion 4'4, the gear 42' in turn is secured by alpin P2 to a shaft 43 journaled in the mounting plates 10V and 1.1, while the pinion 44 engages a gear. 45 mounted for freeV rotation on the, shaft 46.l The hub of .gear 45 is formed with a pinionr 47 engaging a gear 4S. secured to.

a shaft 494 by a pin P3. This shaft is journaled at its lower disposed end in .the plate 111, and its upper disposed end in a; bracket 50 secured to the underside of plate 10, as by screws 51', while to the lower end of shaft 49is secured by means of a pin P4', a pinion 52 serving .for rotating the shaft 46 through a gear 53 secured to that shaft by a pinn P6 upon the engagement of anidle pinion 54 movable -in position for simultaneously engagingy gear 52 on shaft '49v and gear 53 4on shaft. 46,

such engagement being effected by the manual' operation ofv a key member 55' mounted for sliding and rotary movementl in bearings inthe plates andI 11, butA held in nonoperated-position bythe tension of a retractile spring 5631, best seen in Figs. 2 and 4, secured at one end of the under side of mounting plate 11, as by screw 57y, with the .free end of' this spring engaging the lower disposed" end portion of' .the key 55.

The idle pinion 54 is mounted for free rotation on a studtltted in a cylindrical projection 6tly formed withv the mounting plate 1.1 while this stud is held from rotation by a pin P9; Thehub of pinion 54, as shown in Figs. 2 and 3, is formed with a circular groove engagedbyl a forked arm 58 whichis heldin position on the key 55 by a pin P5, rotary movement of shaft 46v4 being effectedv bythe rotation of pinionY 47'V above mentioned, the gear 48', the shaft 49, the pinion 54upon the engagement of the latter with gears 52 and 53 eiected by the operation of'keymember 55.

`The rotation of gear 48, through `pinionA 47, is` effective to rotate a pinion 61' formed on shaft 62, journaledV at v.one end in the bracket 50, and itsother end inthe plate 11, Fig. 2, and on this shaft is mounted for sliding movement a pinion. 63, but held against rotation thereon by a key member 64: i Pinion63 is moved'in engaged' relation with: a gear 65ibythe operation of' a manually operable keyfmember 56"mounted"for sliding and rotary movement in' the plates 10'and` 11., and on this key is 48, and thisgear in engagement withpinion 61: formed on shaft 62 on which the sliding pinion'63 is: keyed for,

rotatingrth'e'y gear 65 and thereby shaft 46.V

The key 56 isheldin the operated-position against the: tension of "a retractile spring 82;by'l afspringpressed vpavvlV 80 engagingasnotch: 811` formed in this* key, which may.' be released byrotatingitfa smallangular distance forL camming ythe' .pawl'l 80 out of; engagement from the.l notch The gear 45,` as-abovefmentioned,,ismounted: for free rotation on shaft 46 and engages a pinion 68: mountedffor` free, rotationonfaa shaft 69; Figs; 2,' 3'and" 4, iittedatits lower'fdispos'edend in the.bracketf50,` (and at its upper end in the plate 10, while apinPIO-servesY .tohold this.

shaft against' rotationin .the bracket. The; hub portion of pinion1681 is Iformed:rvvith Va circularI groove, best seenY in Fig. '3; engaged by` the? forked: end-of arri` arm70 mountedfree on a: key member 71 between collars. 72.t and-i723 forpermittinga small? rotary-.2. movement ofthe" key, these collars being secured to the key by similar pins 74y, .the key 71 being held in the operated position by a spring pressed pawl 76 against the tension of a retractile spring 73 secured to the bracket 50 by means of a Vscrew 74 with its free end engaging the lower end of key 71. In the position shown in Fig. 3, pinion 68 engages a gear 75 keyed to the shaft 46 for rotating this shaft according to the gear ratio from pinion 41 on shaft 17, the gear 42, pinion 44 on shaft 43, gear 45 and through pinion 68, the gear 75 secured to shaft 46 by a pin P8 for rotating the shaft 46 and thereby the discfmirror unit 40-105 according to that speed follow-ing the manual operation of lever member 28 and thereby of bar 35 fromthe positio-n shown in Fig. l to the position for engaging the pivoted pawl 38 with the arm. F of. angle lever 99 to move the lug 104 of arm F1 out of engagement `from the notch 102 in .the disc 105 to cause the rotation of this disc and the mirror 40 carried thereby and operating electrical contacts C2 secured on the mounting plate 10 to perform a function which will `be hereinafter described in detail.

The key 71 and thereby the .pinionr 68 are heldin the operated position by a spring pressed pawl' 76Vv engaging a notch '77, while the release of this key .from pawl 76r is effected by irnparting al small angular movementV to the key so as to cam off the pawl I6A out of engagement from the notch 77, the key being returned'- to normalnon'- operated position -by the tension of spring 73, but with' the pinion 68 remaining in engagement with gear 75.

The key and .the idle pinion 54 are held inthe operated position by a spring pressed pawl 78 engaging aV notch 79, Fig. 2, while the return movement of that key is effected by imparting a small angular movement to that key for camming the pawl 78 out of engagement from the notch 79, the key 55 being returned tonormal position by the tension of spring 56y, and therebymoving the pinion 54 out of engagement from the gear 53 and"I pinion 52.

rThe projecting portion 15 of mountingplate v10may bev constructed to extend any; distance from the; turning' axis of mirror 40for focal adjustment of the'photographic apparatus, as shown in Figs. 1 and 2, and such apparatus may be. secured in adjusted position on the mounting plate extension 15 by a knobV 98. The heel piece 9.1"- of an electromagnet Mlis mounted on a base 92, itself adjustable along Va transversely disposed guiding groover 9 3v forpositioning the armature94 ofthe electromagnetin engaged relation with the shutter operating knob or plunger 95'offthephotographic apparatus, while a mirror 96, Fig. 1,.is mounted'forangular adjustment' on the 'plate 10 relative tothe light pathsformed in'l therim.' 21 of drum 20 and the slit 27 in strip-241m line withthe turning axis of mirror 405 and may be secured in adjusted' position, thereon by a nut97.'

In a typical operation of the shutter speed recording device: ofthe invention, with the photographic apparatus on the'rnounting frame in the position'shown in Figs. l and 2, the operation of lever member. 285 an angular movementdeiined by the length of slot 28Fis effective to move the-bar 35--inpositionto close the normallyopenv contact- C1.V to cause. the. operation of the synchronous motor for rotating the shaft 17 andthe drum Ztlsecurle'di tofthe top disposed'zendfthereof. at a speedof' 1800`revolutionsV per minute.` Rotation of shaft'17 iseffective. to. rotate the mirror 40when the latter is released by the continued. operation of: barY 35: for actuating the angle lever 99, as` above mentioned, the'miiror being geared `for operation at a speed of .251 revolution per second upon the operation of-key 'member 71 in its locked position through the pinion 41',l the gear 42 mounted` on'shaft 43 for rotatonfas asunit with pinion 44, whichl inturn actuate the shaft 4 6 carryingthemirror 40=through1t-he gears 451and- 75; both` engaged by pinion 68 which, as

above mentioned, is mounted forlfree rotation :andrfslid ing movement on shaftA 69S Another mirror speed of .075 revolution per second is provided for recording the speed of slower operating shutters as obtained through the rotation of shaft 17, pinion 41, gear pinion unit 42-44, the gear 45 mounted for free rotation as a unit on shaft 46, the gear 48 in engagement with pinion 47 and the pinions 61 and 63 when the latter has been moved in engagement with gear 65 by the manual operation of key member 56', butit is to be noted that the pinion 68 has been disengaged from gear 45 and held in the disengaged relation by the spring 82l bearing against the lower end of that key member. Y

A third mirror speed of .0375 revolution per second is obtained through the pinion 41, gear pinion unit 42-44, gear 45, pinion 47, gear 48 on shaft 49, the pinion 52 also secured on shaft 49, the gear 53 secured on shaft 46 and pinion 54 mounted on stud 60 when this pinion has been moved in engagement with the pinion 52 and gear 53 by the operation of key member 55 carrying the arm 58.

The recording of the operating speed of an in-between the lens shutter for example on a lm in an ordinary photographic apparatus may be effected by moving the lever member 28 so as to impart a longitudinal movement to the bar 35 to close the contact C1 and thereby causing the energization of the motor which, as above mentioned, operates at the rate of 1800 revolutions per minute, while the continued longitudinal movement of this bar is effective to close the contact C2 for energizing the lamp 23 and move the shutter 29y `formed with lever 28 out from the light paths formed by the slit 27 in strip 24 and the light paths formed in the drum 20 to remain out of the light paths position to the completion of a shutter speed recording operation when the lever 28 is manually returned to normal position, but it is tobe noted that the light pulses thus transmitted are ineffective since the shutter of the photographic apparatus has not been operated. The continued movement of bar 35 as above mentioned is also effective to engage the pawl 38 pivoted thereon with the arm F of angle lever 99 to cause the pivotal movement of this lever and thereby move the lug 104 out of engagement Vfrom the notch 102 in the disc 105 for permitting the rotation of this disc and the mirror 40 carried thereby half a turn for reflecting the light pulses thus generated onto the lens of the photographic apparatus, the release of the mirror being effected simultaneously with the closure of the contact C3 by the pivotal movement of angle lever 99 for causing the energization of electromagnet M1, Figs. 1 and 2., which attracts its armature against the tension of a retractile spring SP to operate the plunger 95 of the photographic apparatus in timed relation with the release of disc mirror unit 40-105 as above mentioned by the pivotal movement of lever 99, the contact spring C3 and angle lever 99 remaining in the operated position held at the periphery of disc 105 until the notch 103 formed in this disc in position diametrically opposite the notch 102 passes'in registry with the lug 104 of angle lever 99, following the recording of the light pulses onto the film in the photographic apparatus during the operation of the shutter therein in the dot pattern P1, for example, in the testing of a so-called in-between the lens shutter or in the patterns P1 and P2, as in the speed testing operation of a focal plane shutter as shown in Fig. 6 on 'a lilm in the photographic apparatus, and the device is now ready for a successive recording operation following the return of the manually operated lever member 28 and thereby the bar 35 in normal non-operated position, as shownv in Fig. l, when the pawl 38 is cammed downwardly by its engagement with the arm F of angle lever 99 thus stopping the operation of the motor, de-energizing the lamp 23 and returning the shutter 29y carried Iby the lever member 28 over the light paths in the drum which may bein registry with the light path in the strip l24. l

The reverse of the wire connections for the motor and because of the fact that a greater number the energization of the lamp 23 may be switched to any of the desired On-Olf and Reverse operating position by a switching device W2 connected to contact C1, in the well known manner. It is to be noted that the three mirror speeds above mentioned have been found to be sufficient for the testing of all shutter speeds used in the photographic apparatus presently in use. In each testing operation the number of light dots printed or recorded on the film of a photographic apparatus is an Iindication of the operating speed of the shutter tested. For example, considering the pattern P2 obtained as a result of the testing of an in-between lens shutter which shows 86 light dots, each of these dots has an elapsed time value of $6400 second or .000185. Therefore this shutter took 86 x .000185 second to operate, or .01591 second expressed in decimals or 1,03 second expressed in fractions of a second. In the testing of a focal plane shutter pattern P2, as above mentioned, shows 86 light dots and P1 shows 77 light dots added to the 86 dots of the P2 pattern=163 divided by 2=81.5, each dot again has an elapsed value of .000185 second. Therefore this focal plane shutter took 81.5 x .000185 second to operate, or .0151 second expressed in decimals or 120151 or 1%;6 second approximately expressed in fractions. In each testing operation the result thus obtained may be compared with the set shutter speed of the photographic apparatus.

In the recording of the speed of a focal plane shutter, of light dots are printed onto the iilm when the slit of the Shutter in the photographic apparatus moves in the direction of the mirror the drum 20 and the mirror geared thereto are rotated (rst) in a clockwise direction to obtain a series of light dots which may be in the pattern or in number as shown at P2 in Fig. 6, whereas the successive speed recording operation of the same shutter, the drum and the mirror, are rotated in a counter-clockwise direction that is in a direction opposite to the operation of the shutter of the photographic apparatus by the operation of switch W2 to the R or reverse position so as to obtain a light dot record of the type shown at P1 added to the record P2 and then taking the average by dividing the number of dots by two as to obtain a true record of the operating time of the operation of the focal plane shutter in the photographic apparatus.

In any shutter speed testing operation, an angular movement of approximately 20 out of 180 or each half of a turn of the mirror is used in projecting the light spots onto and across the lens of the photographic apparatus. For the yfastest speed of a shutter to be tested, the time allowed for calibrating when sha-ft 46 is operated directly through the pinion 41, gear pinion unit 42-44 and gears 45 and 75, both in engagement with pinion 68 upon the operation of key 71, is lAB or .222 seconds, and this speed is used for calibrations from j/1000 Sec. to J,"10 second. The time allowed for calibration at the second speed, upon the operation of key 56 is seconds used for recording shutter speed of A and 1/2 second, while the recording at the third speed, upon the operation of key is 26.66/18=1.482 seconds for calibrating Shutter speed of approximately one second, any of the gear ratios above described may be used, depending upon the type of photographic apparatus the shutter speed of which it is desired to record, thus avoiding the use of a different recording apparatus for each shutter speed.

It is understood that minor changes such as the use of different mirror speeds and dilferent number of light paths in the drum may be made to the invention without departing from the scope of the appended claims.

What I claim is:

l` A device for recording the speed -of a shutter in a photographic apparatus, said device comprising a rotatable drum having light paths at its periphery, a lamp in a normally non-*operating rotatable mirror, a lta onary mirror disposed in the field of the light paths in for `relflecfng the light pulses onto Saidl rotatable mirror for rellecting such light pulses onto the lens Vof the photographic apparatus, normally open sets of electrical contacts, manually operable means for closing contacts in one of said sets to cause the operation of said drum .and said rotatable Iuitrol, and electromagnetic means operable by the closure of the other of said contacts in another of said sets to cause the operation of the shutter in the photographic apparatus in timed relation withthe yoperation of said drum for recording the nurn- -ber of light pulses onto a iilrn in the photographic apparatus.

2. A deyice for recording the speed `of a shutter in a photographic apparatus, said device comprising a cona stant speed motor, a rotatable drurn geared to said nactpr-haying light paths at its periphery, a lamp in Said drurnlfor generating a series of light pulses upon the operation of'said dt'ura, a stationary mirror disposedinthe eld of said light pulses, a rotatable mirror geared to said drum .cooperating vwith said stationary mirror for rellecting the light pulses onto the lens of 'die Photographic apparatus, .an ,elcctrcraegpet having its armature d isposedin operatiye relation with the shutter actuating Said dalla,

pluugerof .the-photographic apparatus, sets of electri-Y cal contacts, manually .operable naeans for actuating cnc set ot said yontacts to cause the energization of said motor `and another set for energizing said lamp timed relation `with the operationof another of said Sels cf said contacts for energizing saidinagnet for operating the `shutter of the photographic apparatus -for recording the lighwtpulses rel'lected by said rotatable mirror onto atiltn in 'such .apparatus .3, A device for recording the operating speed of a shutterin a photographic apparatus having a 'plunger for actuating ,such shutter, said device comprising a constant speed motor, a normally open set of contacts connecting with said motor, light pulse generating means Voperatively connected to said motorgsaid generating means comprising a rotatable drum having light paths at its periphery, a lamp disposed infsaid drum, a pair of normally open contactseonnecting with said lamp, ,a stationary mirror in the field of the light paths fromsaid drum, a rotatable mirror geared to said motor for 4reflecting the light from said stationary mirror onto the lens ofthe photographic apparatus, means for frictionally holding the last mentionedrnirrorfrom rotating upon the'operation of said motor, an electromagnet having its armature disposed in operative relation with the plunger in the photographic apparatus, a set of normally open contacts connecting Withsaid magnet, and manually operable means for successivcly closing the contacts of saidrnotor, the contacts of. said ,lamp operating said holding means to cause the operation of said rotatablemirror, and closing the contacts of said magnet for operating the shutter of the photographic apparatus for recording the light pulses from said generating means onto a film in the photographic apparatus.

4. 'Ina device for recording the speed of a shutter in a. photographic apparatus, the vcombination which consists oi normally non-effective means for generating light pulses according to a constant speed actuating mechanism, means operable for retlecting'the light pulses om said 4light pulse generating means onto the lens of the photographic apparatus, a plunger operable to cause the operation of such shutter an elcctromagnet having its armaturedisposed in operative relation with Ithe plunger ingthe photographic apparatus, aplurality of sets of normallyopen' contacts, andV means manually operable for actuating said contacts in said sets successively to render said light pulse generating means effective and said light rcflcctingmean etective in timed relation to each other and in 4tiine'drelation with the closing operation of the contacts' of saidlmagnetfor operating the shutter inthe photographic apparatus for recording the Alight pulses omlmthlj'-, device Afor recording the speed lof a shutter on a film in aPhOtSIaPhic'apparatus haying a plunger for actuating such vs h'utteigisaid device comprising bassea constant speed motor mounted on 'said base, a' drum actuated by isaidmotor having'ligh't paths at its periphery; a rmirror geared `to saiddrum, a larnp mounted'on said base vinwardly of said drum nfor generat'ing'light pulses upon the rotation'of said drum, manually operable stop means for normally holding saidrnirror from operating upon the rotation of 'said drum, a stationary mirror'disposed in the field of light from said drumtor ,reflecting the light onto said rotatable mirror,v an electromagnet having its armature disposed in operative relation with the plunger the photographic apparatus, a set o f nor.- rnallyoopen contacts for said magnet (closed by the operation of .seid stop arenas following the releaseo'f said mirror to cause the operation of the plunger in the photographic apparatus for .pfciccting ,the light pulses emanating inem s aid ydrum onto a lrn in'such photographic apparatus.

f 6- A device for recordingthe speed of a ,shutter in a photographic apparatus having a plunger for actuating such shutter, said device comprising a constant speed motor, a set of normally open contacts connecting with said motor, a drum actuated by said motor, said drum having a plurality of light paths disposed at egual spaced relation to each .other in rows .oblique rclatiyc vto the turning yairis of said drurn, ,a lamp in said drain, .aser of' normally .open contacts connecting with said lamp, a shutter plate disposed in juxtaposition to the periphery ot said drunrinwardly thereof, said plate hai/.ing an elongated light path disposed in parallel relation to the turning aids of said duim and conunon to saidliglit paths ihsaid drum ,for generating light pulses upon thcpassing of said light paths in registering relationto said elongated light path in said plate, ,a Vsystern .ofrnirrors an clectrornagucthav'ing its armature in operatiye relation with the plunger of the photographic apparatus, a set of normally open contacts for said ruagnet,rnean`si1nanually operable for successively closing the first rn'entionedset of said contacts for energizing said rnotor, `closing the second mentioned set o ffsaidcontacts for energizing said lamp, causing the loperation of one of said mirrors tor reflecting the light from said drum Aontoa lens 'in the photographic apparatus, and closing the thirdrnentioned set of contactsifor energizing Asaid magaetiand thereby causing .theoperation of the plunger in the photographic apparatusV for recording' the'aurnber of pulsesonto aglilrn in such apparatus.

7. A device for recordingthe operating speed of a shutter in a photographic apparatus; said device comprising a cylindrically shaped rotatable member, aplarnp disposed inwardly of said rotatable memben'a 'plurality of light paths carried by said member disposed in oblique relation tothe turning axis ,thereof in ropas git-equal spaced relation to each other," constant speed actuating means for said rotatable member, a stationary plate fdispolsed in juxtaposition to said member having a 4slit forming a light path intersecting with the light paths in said rotatable member successivelyupon the operation of said member, `a rotatable mirror', a stationary mirror disposed in lthe field of said light paths for reflecting'the light onto said rotatable mirror, agear reduction mechanism operatively connecting said rotatable mirror to said member for retiecting the light onto the lensof .the photographic apparatus, an ele'ctromagnet` having its armature disposed in' 'operativerelation With'the shutter injithe photographic apparatus, means manually operable to cause'the energizatin 'of said magnet iritimed relation with the operation 'of said' member' and of said rotatable mirror for projecting .the light pulses-generated upon the rotation of said member onto a lm in the photogpaphic apparatus.

aguacate 8. A device for recording the speed of a shutter in a photographic apparat-us having a plunger for actuating such shutter, said device comprising a light pulse generating mechanism, a constant speed motor for actuating said mechanism, a stationary mirror disposed in the field of the light pulses generated by said mechanism, a normally rotatable mirror for reiiecting the light from said stationary mirror onto the lens in the photographic apparatus upon the operation of said mechanism, a manually operable key member for operatively connecting said operable mirror to said light pulse generating mechanism, a disc-shaped member movable as `a unit with said mirror having stop elements at its periphery for limiting the operation of said mirror following each pulse recording operation, means cooperating with said stop elements for normally holding said mirror `from rotation upon the operation of said light pulse generating mechanism, an electromagnet having its armature disposed in operating relation with the plunger in the photographic apparatus, a set of normally open contacts for said magnet, and a handle lever for actuating said means for closing said contacts for energizing said magnet and thereby causing the operation of the plunger in the photographic apparatus in timed relation with the release of said rotatable mirror for reflecting the light pulses from said stationary mirror onto the lens of the photographic apparatus for recording the number of such light pulses onto a film in such apparatus during the operation of the shutter.

9` A device for recording the speed of a shutter in a photographic apparatus, said device comprising a rotatable drum, a constant speed motor for actuating said drum, a lamp mounted inwardly of said drum, a normally stationary rotatable mirror, a multiple speed mechanism for selectively operatively connecting said rotatable mirror to said drum, said drum having rows of light paths formed in the rim thereof disposed at equal spaced relation to each other, a plate mounted in juxtaposition to the inner periphery of said drum having a slit therein `forming a light path intersected by the successive light paths in said drum for generating light pulses, a stationary mirror disposed at an angle relative to the field of light from said drum to be reflected onto said operable mirror, electromagnetic means for actuating the shutter in the photographic apparatus, normally open contacts operable to cause the energization of said electromagnetic means, and means manually operable to cause the operation of said operable mirror according to the selected speed in timed relation with the closing operation of said normally open contacts and thereby the 10 operation of the shutter in such apparatus for transmitting a number of light pulses generated by the operation of said drum onto a lm in the photographic apparatus for recording such light pulses.

10. A device for recording the speed of a shutter in a photographic apparatus having a plunger for actuating such shutter, said device comprising a constant speed motor, a rotatable member actuated by said motor having light paths, a stationary plate disposed in juxtaposition to said member having a slit therein forming a light path intersecting the light paths in said member upon the rotation of said member, a lamp cooperating with said member for generating series of light pulses a stationary mirror, a rotatable shaft geared to said member, a mirror-disc unit mounted on said shaft, friction means operatively connecting said unit to said rotatable shaft, said rotatable mirror cooperating with said stationary mirror for reecting the light pulses onto the lens in a photographic apparatus, manually operable stop means cooperating with means carried by said disc for holding said unit from rotating upon the operation of said member, an electromagnet having its armature disposedtin operative relation with the plunger in the photographic apparatus, sets of normally open electrical contacts closed successively by the operation of said manually operable means, the operation of the contacts in one of said sets causing the energization of said motor for actuating said member, the operation of other contacts in another set by the continued movement of said manually operable means causing the energization of said lamp, and means actuated by the operation of said manually operable stop means to cause the operation of said discmirror unit and simultaneously closing the contacts in another of said sets to cause the energization of said magnet for operating the plunger in the photographic apparatus and thereby the shutter therein for recording the number of pulses lgenerated by the operation of said member and the energization of said lamp upon a film in such apparatus.

References Cited in the tile of this patent UNITED STATES PATENTS 808,384 Kershaw Dec. 26, 1905 1,431,897 Riddell Oct. 10, 1922 2,102,708 Howle Dec. 21, 1937 2,296,676 Kearsley Sept. 22, 1942 FOREIGN PATENTS 400,100 Germany Aug. 15, 1924 

